build and include promises as npm dependencies

Author: guybedford

test/test.html

@@ -14,6 +14,16 @@
     // delete window.Promise;
   </script>
 
+  <script>
+    // test promise polyfill
+    // delete window.Promise;
+  </script>
+
+  <script src="../node_modules/es6-promise/dist/promise-1.0.0.js"></script>
+
+  <script src="../lib/loader.js"></script>
+  <script src="../lib/system.js"></script>
+
   <!-- run Grunt first to create this file -->
   <script src="../dist/es6-module-loader.js"></script>